Removal of cadmium from aqueous solution using modified magnetic glycine modified cross-linked chitosan resin

Abstract

Water is the most vital substance for life on the earth and a precious resource for human civilization for many critical areas such as: food, energy, industrial, and the environment. Water resources are increasingly decreasing and need to be preserved. In recent years, industrialization, agricultural activities, rapid population growth and urbanization have contributed negatively to clean water resources (Ali et al., 2018; Basheer, 2018). Different pollutants such as pharmaceuticals, pesticides, dyes and heavy metals have contaminated the water resources. Presence of these contaminants in aqueous environments is environmentally hazardous for human beings and animals. Among these pollutants, heavy metal is one of the most hazardous species, due to their toxic nature especially when their concentrations exceed the allowable limits in the ecosystem. These pollutants are non-biodegradable and can be absorbed by marine life. Once high concentrations of heavy metals enter the food chain, they tend to accumulate in living tissues and thus, dysfunction the system of the human bodies (Fu, 2011).

The Antibacterial Activity of Egyptian Wasp Chitosan-Based Nanoparticles against Important Antibiotic-Resistant Pathogens

“…In the current investigation, FTIR analysis of wasp chitosan revealed the band spectrums of various bonds, which are consistent with [ 8 ] and others [ 43 , 44 ]. The ionic interaction between the positively charged NH3+ groups of chitosan and phosphate groups and the negatively charged phosphate groups (P3O105-) of TPP was ascribed to the changes seen in the FTIR spectra of WCSNPs in the peaks at 1641 cm −1 and 1581 cm −1 .…”

“…The MW was determined to be about 1990 Da since it has a significant impact on its biological activity [ 41 , 42 ]. In general, the MW of insect-derived chitosan ranges from 26 to 300 kDa [ 38 ], lower than that of commercial chitosan (100–1000 kDa) [ 43 ], so the good solubility in a low concentration of acetic acid is attributed to its low molecular weight; in addition, it is related to greater antimicrobial activity [ 41 , 42 ].…”

Ultrasonic Field Induces Better Crystallinity and Abundant Defects at Grain Boundaries to Develop CuS Electromagnetic Wave Absorber

“…As per the deconvolution outcomes, four emissions exist for CuS spanning 463.4–464.2, 484–485.9, 520–521.0, and 568–571.9 nm, respectively. [ 55 ] Notably, the peaks in the green region appearing at 521 nm are related to the defects in the GBs and interactions between the GBs. [ 56 ] Consequently, the ratio of peak area at 520–521.0 nm to the total peak area was employed to evaluate the defects at the GBs and interactions between GBs among different anions, leading to UCCu > UNCu > UACu > USCu, which is in good agreement with the XPS and UV–vis DRS results.…”